Pulp-screen



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. No; 522,463. Patgntedpruly is, 1894'.

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No. 522,463. Patented July 3, 1894.

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J. J. PLANDBRS.

PULP scREEN.

No. 522,463. Patented July 3.1894.

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l UNITED STAT-Es PATENT OFFICE.

JOHN J. ELANDERS, or PORTLAND, MAINE.

VPULP-SCREEN.

SPECIFICATION forming part of Letters Patent No. 522,463, dated July 3, 1894.

' Application iiled November 26, 189,2. Serial No. 453,256. (No model.)

To all whom it may concern:

U l 3e it knownthat I, VJOHN J. FLANDERs, al citizen of the UnitedA States, residing at Port-v land, 1n the county of Cumberland and State of Maine, have invented'certain new and use-l ful Improvements in Pulp-Screens; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which 1t appertains to make and use the same.

My lnvention relates to improvements in pulp screens and consists in new and iinproved means for hanging or supporting the screen frame, new and imp'rovedfmeans for operatmg said frame, and in certain other details of construction, which will be hereinafter particularly described.

,In the. drawings herewith accompanying and maklng a part of this application, Figure 1 is a horizontal sectional view taken on one side above and on the other side below the cross heads K, the top of the oil box in the latter being removed. Fig. 2. is a side elevation of my improved screen partly in section. F1g. 3 1s a central vertical cross section of same, with parts broken away to show pack- 1ng for lifter rod. Fig. 4 is a detail plan view of. the hydraulic'mechanism removed from the o1l box and having parts broken away to show Interior. Fig. 5 is a central vertical cross section of same, and Fig. 6 is a horizontal section of the hydraulic mechanism for imparting vibratory motion to the screen frame.

Same letters refer to like parts. I In said drawingsXrepresents the base castings and Y a girder connecting the same.

each end of the machine is a box A, containlng a suitable liquid medium, said box comprlsmg an outer head X0, an inner head X', a stuffing-box X2 and a cover X4. In said liquid box are a cylinder M, piston head H and plston rod J which extends upwardly through the top of said box. Beneath said cylinder is a chamber M' opening into said cylinder by` Way of port m0 as seen in Fig. 5. Opening from the liquid box into chamber M is an inlet port m', as seen in Fig. 6. Adapted to penetrate chamber M and alternately to open and. Aclose port m' is a reciprocating plunger O. Leading from chamber M into the oil box is a port m2 having in its path a p plug cock l? and a check valve Q. -Said plug 'cock may be operated in any convenient manner as for example by the series of arms and levers p, p', p3, p2, p0. Mounted on the base are standards R. Resting on said standards are striking bars S, on the outer ends of which are strikers s and connecting vsaid striking bars may be employed lateral supporting rods r. Mounted in suitable bearings is a shaft U having on one end a driving pulley V and.

on the other end a crank disk TV. A connecting rod'T connects the crank disk and the plunger O, or an adjustable sleeve Z adapted to slide on said plunger, whereby arecipro-` cating motion may be imparted to plunger O by the rotation of said disk.' To lessen the shock caused by the plunger entering the confined liquid medium the plunger m ay have its end N conical.

In Fig. 6 the plunger is shown after it has penetrated chamber M', and when in this position,'port m is closed. When the plunger is withdrawn to the position shown in dotted lines in Fig. 6, port m is open and the liquid can iiow freely therethrough and into the open liquid box A', and the pressure being' removed from beneath the piston the Weight of the screen frame causes the piston to descend, aided during part of the descent, by

atmospheric pressure due to the vacuum created by the withdrawal of the plunger from the chamber. This pressure continues until the plunger is withdrawn suciently to open port m', and permit the liqudto flow out into box A. As the plunger again enters charnber M', it closes port fm', this confining the liquid Within chamber M and consequently Ycauses the piston and the screen supported` thereby to rise. When it is desired to lessen 'the length of the stroke of the piston, the

plug cock is turned so that apart of the liquid confined in chamber M can escape through port m2.

Supported in the frame of the machine is a tank C to receive the pulp as it passes through the screen D which rests on bars cl set in frame A. The screen frame A is mounted above said tank, its sides extending down some distance intothe tank. Between the tank and the exterior walls of the screen frame A is a packing E. The screen frame is mounted on the ends of lifter rods L, there being two of said rods Vat each end of the mal IOO chine as shown in the present drawings. The lifter rods may be pivotally attached to the bottom of the screen frame or to plates a attached thereto by means of pins Z', and they pass down through the bottom of the tank and through stuffing boxes Z. The lifter rods are connected by a yoke K to which is attached the piston rod J. Outside of the tank is set a trough B and leading from the bottom of the tank into said trough is a port b. The trough B has an outiiow pipe F in which is set an adjustable sleeve G carried by a screw g running in a screw-threaded support g2 and having alever Wheel g for oper.-` ating the same. The adjustable sleeve set in the outflow pipe in trough B may be raised or lowered and thus regulate the depth of pulp in the space between the tank and the screens, thereby increasing or diminishing the suction.

Having thus described my invention and its use, I claim- 1. In a pulp screen, a vibratory screen frame mounted on connecting rods, a piston operating in a confined liquid medium, a piston rod attached to said connecting rods, and a plunger adapted to be forced into the chamber beneath said piston to force said piston upward by hydraulic pressure and to be withdrawn therefrom to allow the piston to be forced down by gravity, atmospheric pressure, &c., substantiall y as and for thepnrposes set forth.

2. In a pulp screen, a vibratory screen mounted in a suitable tank, connecting rods pivotally attached to said screen frame, a cylnder set in a liquid medium, a piston having a rod connected with said connecting rods and adapted to operate in said cylinder, a chamber beneath said cylinder, and a plunger having its entering end cone shaped and adapted to be forced into and withdrawn from said chamber to operate said piston, substantially as and for the purposes set forth.

3. In a pulp screen, a vibratory screen frame mounted on connecting rods, a piston operating in a confined liquid medium, a piston rod attached to said connecting rods, a plunger adapted to penetrate the chamber beneath the piston cylinder, a plug cock and means for operating said cock to regulate the length of the piston stroke, as and for the purposes set forth.

Intestimony whereof I affix my signaturein presence of two witnesses.

JOHN J. FLANDERS.

Witnesses:

ELGIN C. VERRILL, NATI-IAN CLIFFORD. 

